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Asked: 2026-05-28T05:39:28+00:00

From Windows I can communicate with a serial port device using the following commands:

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From Windows I can communicate with a serial port device using the following commands:

mode com1: baud=9600 data=8 parity=n stop=1
copy con com1
alt+18alt+2ctrl+z

The device starts the requested operation.

When I try to accomplish the same operation from a stand-alone Debian box or from a Debian VirtualBox instance of the same Windows machine, I had no luck so far.

Here are equivalent Linux commands (at least I think so):

stty -F /dev/ttyS0 speed 9600 cs8 -cstopb -parenb
echo '\x12\x02' > /dev/ttyS0

Nothing happens.

How can I do it?

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1 Answer

  1. Editorial Team
    echo '\x12\x02'

    will not be interpreted, and will literally write the string \x12\x02 (and append a newline) to the specified serial port. Instead use

    echo -n ^R^B

    which you can construct on the command line by typing CtrlVCtrlR and CtrlVCtrlB. Or it is easier to use an editor to type into a script file.

    The stty command should work, unless another program is interfering. A common culprit is gpsd which looks for GPS devices being plugged in.

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